U.S. patent number 11,457,119 [Application Number 17/241,807] was granted by the patent office on 2022-09-27 for image forming apparatus.
This patent grant is currently assigned to TOSHIBA TEC KABUSHIKI KAISHA. The grantee listed for this patent is TOSHIBA TEC KABUSHIKI KAISHA. Invention is credited to Toshihiro Imai, Yuki Koike, Fumiharu Nakayama, Takashi Tomiyama.
United States Patent |
11,457,119 |
Nakayama , et al. |
September 27, 2022 |
Image forming apparatus
Abstract
According to an embodiment, an image forming apparatus includes
a sheet conveyance unit that is configured to transport a print
medium along a conveyance path. An antenna is configured to emit
radio waves towards a predetermined portion of the conveyance path.
A controller is configured to control the antenna to emit the radio
waves towards the predetermined portion with a polarization
direction set according to a type of the print medium being
transported by the sheet conveyance unit. The print medium may
have, for example, one or more wireless tags thereon or
therein.
Inventors: |
Nakayama; Fumiharu (Yokohama
Kanagawa, JP), Tomiyama; Takashi (Sunto Shizuoka,
JP), Koike; Yuki (Sunto Shizuoka, JP),
Imai; Toshihiro (Sunto Shizuoka, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
TOSHIBA TEC KABUSHIKI KAISHA |
Tokyo |
N/A |
JP |
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|
Assignee: |
TOSHIBA TEC KABUSHIKI KAISHA
(Tokyo, JP)
|
Family
ID: |
1000006584492 |
Appl.
No.: |
17/241,807 |
Filed: |
April 27, 2021 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20220053106 A1 |
Feb 17, 2022 |
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Foreign Application Priority Data
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Aug 14, 2020 [JP] |
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JP2020-136943 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04N
1/00482 (20130101); H04N 1/00602 (20130101); H04N
1/00411 (20130101); H04N 1/32138 (20130101); H01Q
1/2208 (20130101); H01Q 15/246 (20130101) |
Current International
Class: |
H04N
1/32 (20060101); H01Q 1/22 (20060101); H01Q
15/24 (20060101); H04N 1/00 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2007203487 |
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Aug 2007 |
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JP |
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2010061314 |
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Mar 2010 |
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JP |
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Other References
Extended European Search Report dated Nov. 9, 2021, mailed in
counterpart European Application No. 21179464.9, 5 pages. cited by
applicant.
|
Primary Examiner: Bataille; Frantz
Attorney, Agent or Firm: Kim & Stewart LLP
Claims
What is claimed is:
1. An image forming apparatus, comprising: a sheet conveyance unit
configured to transport a print medium along a conveyance path; an
antenna configured to emit linearly polarized radio waves with
different polarization directions towards a predetermined portion
of the conveyance path; and a controller configured to select a
polarization direction according to a type of the print medium
being transported by the sheet conveyance unit and control the
antenna to emit a linearly polarized radio wave with the selected
polarization direction towards the predetermined portion.
2. The image forming apparatus according to claim 1, further
comprising: an input unit configured to receive a user input
designating the type of the print medium.
3. The image forming apparatus according to claim 2, wherein the
input unit is a touch panel display.
4. The image forming apparatus according to claim 2, further
comprising: a storage unit storing polarization direction
information for a plurality of types of print media, wherein the
controller is configured to select the polarization direction by
reading the polarization direction information for the designated
type of the print medium according to the user input received via
the input unit.
5. The image forming apparatus according to claim 1, further
comprising: a storage unit storing polarization direction
information for a plurality of types of print media, wherein the
controller is configured to select the polarization direction by
reading the polarization direction information.
6. The image forming apparatus according to claim 1, further
comprising: a wireless tag communication device connected to the
antenna and configured to write information to a wireless tag on
the print medium being transported by the sheet conveyance unit
using the radio waves emitted by the antenna.
7. The image forming apparatus according to claim 6, further
comprising: a printing unit configured to form an image on the
print medium.
8. The image forming apparatus according to claim 1, wherein the
antenna is configured to selectively emit radio waves at one of a
first polarization direction substantially perpendicular to a
conveyance direction of the print medium through the predetermined
portion of the conveyance path or a second polarization direction
substantially parallel to the conveyance direction of the print
medium through the predetermined portion of the conveyance
path.
9. The image forming apparatus according to claim 1, further
comprising: an input unit configured to receive a user input
designating the type of the print medium; a wireless tag
communication device connected to the antenna and configured to
write information to a wireless tag on the print medium being
transported by the sheet conveyance unit using the radio waves
emitted by the antenna; and a storage unit storing polarization
direction information for a plurality of types of print media,
wherein the controller is configured to select the polarization
direction by reading the polarization direction information for the
designated type of the print medium according to the user input
received via the input unit.
10. The image forming apparatus according to claim 9, further
comprising: a printing unit configured to form an image on the
print medium.
11. The image forming apparatus according to claim 9, wherein the
antenna is configured to selectively emit radio waves at one of a
first polarization direction substantially perpendicular to a
conveyance direction of the print medium through the predetermined
portion of the conveyance path or a second polarization direction
substantially parallel to the conveyance direction of the print
medium through the predetermined portion of the conveyance
path.
12. The image forming apparatus according to claim 1, wherein the
predetermined region is upstream of a pair of registration rollers
along the conveyance path.
13. The image forming apparatus according to claim 1, wherein the
antenna is a single antenna.
14. The image forming apparatus according to claim 1, further
comprising: a wireless tag communication device configured to read
information from a wireless tag on the print medium being
transported by the conveyance unit, wherein the controller is
configured to select the polarization direction according to the
information read from the wireless tag indicating the type of the
print medium.
15. The image forming apparatus according to claim 1, further
comprising: a manual feed tray from which print media can be
supplied to the sheet conveyance unit, wherein the predetermined
portion of the conveyance path is at position above a level of the
manual feed tray.
16. A sheet processing method, comprising: identifying a type of a
print medium; identifying wireless tag position information for the
print medium according to the identified type of the print medium;
setting parameters for writing information to one or more wireless
tags on the print medium according to the identified wireless tag
position information; starting conveyance of the print medium along
a conveyance path of an image forming apparatus; beginning a clock
at the start of the conveyance of the print medium along the
conveyance path; writing information to a first wireless tag on the
print medium using radio waves of a first polarization direction
after an elapse, according to the clock, of a first time since the
start of the conveyance of the print medium, the first time and the
first polarization direction being parameters for writing
information set according to the identified wireless tag position
information; and writing information to a second wireless tag on
the print medium using radio waves of a second polarization
direction after an elapse, according to the clock, of a second time
since the start of the conveyance of the print medium, the second
time and the second polarization direction being parameters for
writing information set according to the identified wireless tag
position information.
17. The sheet processing method according to claim 16, wherein the
first and second polarization directions are different polarization
directions.
18. The sheet processing method according to claim 17, wherein
identifying the type of the print medium comprises wirelessly
reading information from a wireless tag on the print medium.
19. The sheet processing method according to claim 17, wherein
identifying the type of the print medium comprises receiving a user
input designating the type of the print medium.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon, and claims the benefit of priority
of, Japanese Patent Application No. 2020-136943, filed Aug. 14,
2020, the entire contents of which are incorporated herein by
reference.
FIELD
Embodiments of the present disclosure relate to an image forming
apparatus.
BACKGROUND
Conventionally, an image forming apparatus capable of writing tag
information to an RFID tag attached to a print medium is known. In
general, writing of tag information occurs during the conveyance of
the print medium within the image forming apparatus.
In such a case, the image forming apparatus emits radio waves to a
predetermined emission region on the path through which the print
medium passes during conveyance, and writes tag information to an
RFID tag that has been attached to the print medium. However, the
emission region typically includes a high gain region for which the
gain of the antenna of the RFID tag is higher than a desired gain
and a low gain region where the gain is lower than a desired gain.
Therefore, the image forming apparatus may sometimes fail to write
the tag information when the print medium passes through the
emission region. This problem could be solved by increasing the
number of antennas that radiate radio waves. However, it is usually
not preferable to increase the number of antennas because the
manufacturing cost of the image forming apparatus increases.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts a configuration of an image forming apparatus of an
embodiment.
FIG. 2 is a diagram showing an example of a distribution high gain
regions and low gain regions in a radiation region when an image
forming apparatus radiates a horizontally polarized wave to the
radiation region.
FIG. 3 is a diagram showing an example of a distribution of high
gain regions and low gain regions in a radiation region when an
image forming apparatus radiates a vertically polarized wave to the
radiation region.
FIG. 4 is a diagram of positions on a surface of a print medium for
two wireless tags.
FIG. 5 depicts aspects of a control unit.
FIG. 6 flowchart of processing by which an image forming apparatus
writes tag information to a wireless tag.
FIG. 7 depicts an operating screen by which an image forming
apparatus receives an input operation from a user for selecting the
type of print medium.
DETAILED DESCRIPTION
In general, according to one embodiment, an image forming apparatus
includes a sheet conveyance unit configured to transport a print
medium along a conveyance path, an antenna configured to emit radio
waves towards a predetermined portion of the conveyance path, and a
controller. The controller is configured to control the antenna to
emit the radio waves towards the predetermined portion with a
polarization direction set according to a type of the print medium
being transported by the sheet conveyance unit.
An image forming apparatus according to an example embodiment will
be described with reference to the drawings. In the drawings, the
same components are denoted by the same reference numerals. An
image forming apparatus 1 will be described as one example of an
image forming apparatus according to the present disclosure.
(Configuration of Image Forming Apparatus)
The configuration of an image forming apparatus will be described
with reference to FIG. 1. FIG. 1 is a diagram illustrating an
example of a configuration of an image forming apparatus 1
according to an embodiment.
The image forming apparatus 1 forms an image on a print medium, and
is, for example, a multifunction peripheral, a copier, a printer,
or the like. In this context, the print medium is any medium on
which the image forming apparatus 1 can perform processing for
image formation or the like. For example, the print medium can be
printing paper, label paper, a plastic film, or the like.
The image forming apparatus 1 specifies the type of a print medium
to be subjected to processing desired by a user according to an
operation received from the user. The print medium can be
classified according to size, thickness, material, and/or the
presence or absence of a wireless tag. A print medium having a
wireless tag is a print medium to which one or more wireless tags
have been attached. A print medium having no wireless tag is simply
a print medium to which no wireless tag has been attached. A print
medium having the wireless tag can be further classified according
to the position(s) of the one or more attached wireless tags. The
position of at which a wireless tag is attached can be represented
by, for example, information indicating an area occupied by the
wireless tag from among areas on at least one of a front surface or
a back surface of the print medium. The position may be represented
by other information such as coordinates or designations capable of
indicating the position of the wireless tag on the print
medium.
The wireless tag is, for example, an RFID (Radio Frequency
Identification) tag, but is not limited thereto. The wireless tag
generally has a shape having a long axis and a short axis and is
affixed on a front surface or a rear surface of the print medium.
When the wavelengths of radio waves are the same, the radio tag
interacts more strongly with a polarized wave whose polarization
plane is parallel (or more substantially so) to the long axis than
with a polarized wave whose polarization plane is perpendicular (or
more substantially so) to the long axis. In this context, a strong
interaction means that the radio wave is less likely to pass
through the wireless tag without result and the radio wave reaching
the wireless tag is thus more likely to be absorbed and/or
reflected (returned) by the wireless tag.
The image forming apparatus 1 forms an image on a print medium of a
type specified in advance according to an operation received from a
user. For example, when a first print medium PRA is selected by the
user, the image forming apparatus 1 forms an image appropriate for
the first print medium PRA type. In this example, the first print
medium PRA type is A4-size paper of normal (plain) thickness having
two wireless tags. When a second print medium PRB type is selected,
the image forming apparatus 1 forms an image appropriate for the
second print medium PRB type. In this example, the second print
medium PRB type is a thick paper of A4 size and has no wireless
tags.
The image forming apparatus 1 writes tag information to each of the
one or more wireless tags attached to a print medium according to
an operation received from a user. For example, when the first
print medium PRA type is specified, the image forming apparatus 1
writes tag information to each of the two wireless tags attached to
the first print medium PRA.
In order to write the tag information to the wireless tag(s), the
image forming apparatus 1 includes an antenna that radiates radio
waves to a predetermined radiation region RA on a path through
which the print medium passes during conveyance through the image
forming apparatus 1.
The image forming apparatus 1 causes the antenna to radiate
polarized waves to the radiation region RA. However, the radiation
region RA includes a high gain area, where the gain of the antenna
of the wireless tag attached to the print medium is higher than a
desired gain, and a low gain area, where the gain of the antenna of
the wireless tag is lower than the desired gain.
As shown in FIGS. 2 and 3, the distribution of the high gain
regions and the low gain regions in the radiation region RA changes
according to the polarization direction of the polarized wave
radiated by the image forming apparatus 1.
FIG. 2 is a diagram illustrating an example distribution of high
gain regions and low gain regions in the radiation region RA when
the image forming apparatus 1 radiates a horizontally polarized
wave to the radiation region RA. In FIG. 2, a region HA in the
radiation region RA is an example of a high gain region. In the
radiation region RA, a region hatched in the same manner as the
region HA also indicates an example of the high gain region in this
case. In FIG. 2, a region HB in the radiation region RA is an
example of a low gain region in this case. In the radiation region
RA, a region hatched in the same manner as the region HB also
indicates an example of the low gain region. The direction
indicated by an arrow AA illustrated in FIG. 2 indicates a forward
conveyance direction when the print medium passes through the
radiation region RA, that is, the conveyance direction of the print
medium through the radiation region RA. As shown in FIG. 2, the
high gain regions are distributed so as to generally extend in the
direction orthogonal to the conveyance direction of the print
medium.
FIG. 3 is a diagram illustrating an example of a distribution of
high gain regions and low gain regions in the radiation region RA
when the image forming apparatus 1 radiates a vertically polarized
wave to the radiation region RA. In FIG. 3, the region HC within
the radiation region RA shows an example of the high gain region.
In the radiation region RA, a region hatched in the same manner as
the region HC also indicates an example of the high gain region. In
FIG. 3, a region HD in the radiation region RA is an example of a
low gain region. In the radiation region RA, a region hatched in
the same manner as the region HD also indicates an example of the
low gain region. As shown in FIG. 3, the high gain region in this
case is distributed so as to extend generally along the conveyance
direction of the print medium.
As shown in FIGS. 2 and 3, the distribution of the high gain
regions and the low gain regions in the radiation region RA changes
according to the polarization direction of the wave radiated by the
image forming apparatus 1.
The position where the wireless tag is attached on the print medium
can be different for each type of print medium. For example, two
wireless tags attached to a first type print medium can be attached
to the surface of the print medium as shown in FIG. 4. FIG. 4
indicates a conveyance direction in which the first print medium
PRA is intended to be conveyed in the image forming apparatus 1. As
shown in FIG. 4, two labels (LBA, LBB) are attached to a first
print medium PRA. One of the two labels is the label LBA. The other
of the two labels is a label LBB.
The label LBA is, for example, an article label for identifying an
article to be stored in a returnable container to which the first
print medium PRA will be ultimately attached. In other examples,
the label LBA may be another label type instead of an article
label. A wireless tag TGA is attached to the label LBA. The shape
of the wireless tag TGA shown in FIG. 4 is a rectangular shape,
but, in other examples, may be another shape having a long axis and
a short axis. The label LBA is attached to the first print medium
PRA such that the long axis of the wireless tag TGA is parallel or
aligned with respect to the conveyance direction.
The label LBB is, for example, a returnable container label for
identifying a returnable container to which the first print medium
PRA will be ultimately attached. In other examples, the label LBB
may be another label type instead of a returnable container label.
A wireless tag TGB is attached to the label LBB. The shape of the
wireless tag TGB is a rectangular shape, but, in other examples,
the shape may be another shape having a long axis and a short axis.
The label LBB is attached to the first print medium PRA such that
the longitudinal direction of the wireless tag TGB is perpendicular
(or substantially so) to the conveyance direction.
When the tag information is to be written to the wireless tag TGA,
the image forming apparatus 1 can reduce the possibility of writing
failure by emitting a vertically polarized wave. This is because,
as described above, the radio tag interacts more strongly with a
polarized wave whose polarization plane is parallel to its long
axis than with a polarized wave whose polarization plane is
perpendicular to its long axis. On the other hand, when the tag
information is written to the wireless tag TGB, the image forming
apparatus 1 uses a horizontally polarized wave to reduce the
possibility of writing failure. From this, it can be understood
that by changing the polarization direction of the radiated wave in
accordance with the type of the print medium, it is possible to
reduce failures in writing the tag information to the wireless
tag(s).
The image forming apparatus 1 identifies the type of the print
medium and changes the polarization direction of the polarized wave
radiated from the antenna based on the polarization direction
information associated with the type of the print medium. The
polarization direction information indicates the polarization
direction of radio waves to be used in writing tag information. As
such, the image forming apparatus 1 can reduce the failures in
writing the tag information to the wireless tag(s). As an example,
a case where the image forming apparatus 1 changes the polarization
direction of the linearly polarized wave according to the type of
the print medium having the wireless tag will be described. That
is, in this example, the image forming apparatus 1 switches the
polarization to be radiated between horizontal polarization and
vertical polarization according to the print medium type. The image
forming apparatus 1 may also be configured to change the
polarization direction of a circularly polarized wave according to
the print medium type in some examples. In other examples, the
image forming apparatus 1 may be configured to change the
polarization direction of the radio wave by switching between a
linear polarized wave and circularly polarized wave according to
the print medium type. In general, the image forming apparatus 1
may be configured to change the polarization direction of the radio
wave in various manners according to the print medium type.
The polarization direction information may be any information as
long as it can indicate the polarization direction of the radio
wave to be used with the corresponding print medium type. For
example, the certain polarization direction information may be a
code for causing the control unit 110 to perform a process for
matching the polarization direction of the polarized wave radiated
from the antenna 131 with the polarization direction indicated by
the polarization direction information. In such a case, the control
unit 110 matches the polarization direction of the polarized wave
radiated from the antenna 131 with the polarization direction
indicated by the polarization direction information based on the
code.
For example, certain polarization direction information may
indicate a first feeding point or a second feeding point of the
antenna 131. In this case, the control unit 110 matches the
polarization direction of the polarized wave radiated from the
antenna 131 with the polarization direction indicated by the
polarization direction information.
For example, certain polarization direction information may be an
ID (Identification) value associated with the polarization
direction. In this case, the control unit 110 stores information in
which the ID value and the polarization direction are associated
with each other, and causes the polarization direction of the
polarized wave radiated from the antenna 131 to be the polarization
direction associated with the ID value.
For example, certain polarization direction information may be tag
position information associated with the polarization direction.
The tag position information in this context thus indicates a
position or positions at which one or more wireless tags are
attached to a print medium. In this case, the control unit 110
stores information in which the tag position information and the
polarization direction are associated with each other, and causes
the polarization direction of the polarized wave radiated from the
antenna 131 to match the polarization direction associated with the
tag position information.
The image forming apparatus 1 includes a printer unit 11, a control
panel 12, a wireless tag communication device 13, a manual feed
tray TA, and a sheet discharge tray TB. The image forming apparatus
1 may include other members, components, devices, and the like in
addition to the printer unit 11, the control panel 12, the wireless
tag communication device 13, the manual feed tray TA, and the sheet
discharge tray TB.
The printer unit 11 includes a control unit 110, a paper feed
cassette 111, a paper feed cassette 112, and an image forming unit
114.
The control unit 110 controls the overall operations of the image
forming apparatus 1. In other words, the control unit 110 controls
each of the printer unit 11, the control panel 12, the wireless tag
communication device 13, and the image forming unit 114.
The paper feed cassette 111 stores print media of a first type
selectable by a user. As an example, a case where the first print
medium PRA is stored in the paper feed cassette 111 will be
described.
The paper feed cassette 112 stores print media of a second type
selectable by a user. As an example, a case where the second print
medium PRB is stored in the paper feed cassette 112 will be
described.
The control panel 12 includes an operation receiving unit and a
display unit.
The operation receiving unit receives an input operation from a
user. The operation receiving unit comprises an input device, such
as a touch pad, an input key, or the like. The operation receiving
unit outputs information to the control unit 110 corresponding to
the input operation received from the user.
The display unit displays an image corresponding to an input
operation received via the operation receiving unit. The display
unit is an image display device, and is, for example, a liquid
crystal display, an organic EL (Electro Luminescence) display, or
the like. The display unit may be configured integrally with the
operation receiving unit as a touch panel.
The image forming unit 114 conveys a print medium and forms an
image on the print medium corresponding to image data acquired from
the control unit 110. The image forming unit is under the control
of the control unit 110. For convenience of description, forming an
image on a print medium is referred to as printing.
The wireless tag communication device 13 includes an antenna 131
that radiates radio waves to a predetermined radiation region RA on
a conveyance path through which a print medium passes when conveyed
by the image forming unit 114.
The antenna 131 is, for example, a single antenna that radiates
radio waves to the radiation region RA. In general, a single
antenna is preferable for an image forming apparatus 1 to reduce
manufacturing cost as compared with a case where the antenna 131
includes a plurality of antennas. That is, when a single antenna is
provided as the antenna 131, the image forming apparatus 1 may
still reduce tag writing failures, but without the increased
manufacturing costs associated with inclusion of a plurality of
antennas. However, in some embodiments antenna 131 may include a
plurality of antennas and benefits may still be associated with
reduction in writing failures and/or reduced manufacturing costs by
use of fewer total antennas that might otherwise be required.
The antenna 131 has two feeding points: a first feeding point and a
second feeding point. The antenna 131 radiates a first polarized
wave when power is supplied to the first feeding point. When power
is supplied to the second feeding point, the antenna 131 radiates a
second polarized wave. In some examples, the antenna 131 may have
configured to have only one feeding point. In other examples,
antenna 131 may have three or more feeding points. The direction
indicated by the arrow k in FIG. is an example of the direction in
which the antenna 131 radiates the first polarized wave or the
second polarized wave.
The first polarized wave and the second polarized have polarization
directions different from each other. As an example, the case where
the first polarized wave is a vertically polarized wave and the
second polarized wave is a horizontally polarized wave will be
described. In this example, both the first polarized wave and the
second polarized wave are linearly polarized waves. That is, in
this example, the antenna 131 radiates only a linearly polarized
wave to the radiation region RA. In some examples, at least one of
the first polarized wave and the second polarized wave may be
another type of polarized wave besides linearly polarized waves,
such as a circularly polarized wave. However, when the first
polarized wave and the second polarized wave are linearly polarized
waves, the image forming apparatus 1 can more locally radiate the
polarized waves from the antenna 131. As a result, it is possible
to reduce the possibility that the image forming apparatus 1
conflicts with a problematic radio wave band of the different
countries in which such a device might be operated.
The wireless tag communication device 13 causes the antenna 131 to
radiate one of the first polarized wave or the second polarized
wave under the control of the control unit 110. Thus, the wireless
tag communication device 13 can write the tag information to one or
more wireless tags attached to the print medium. The method of
writing the tag information to the wireless tag may be any method
without limitation. Therefore, the details of the method of writing
the tag information to a wireless tag will not be described.
(Configuration of Image Forming Unit)
The image forming unit 114 includes an intermediate transfer belt
20. The image forming unit 114 includes a driven roller 21, a
backup roller 22, a secondary transfer roller 23, two registration
rollers 24, and a manual feed roller 25. The image forming unit 114
includes an image forming station 31, an image forming station 32,
an image forming station 33, and an image forming station 34. The
image forming unit 114 also includes a fixing device AD and a
duplex printing device DF.
The intermediate transfer belt 20 is a belt on which toner images
are initially transferred from the four image forming stations (31,
32, 33, 34). The intermediate transfer belt 20 is supported by
driven roller 21, backup roller 22, and the like. The intermediate
transfer belt 20 rotates in a direction indicated by an arrow m in
FIG. 1. More specifically, the image forming unit 114 rotates the
intermediate transfer belt 20 in this direction by a motor under
the control of the control unit 110.
The image forming station 31 is for forming a Y (yellow) image. The
image forming station 32 is for forming an M (magenta) image. The
image forming station 33 is for forming a C (cyan) image. The image
forming station 34 for forming a K (black) image. In the image
forming unit 114, this set of four image forming stations (31, 32,
33, 34) are placed below the intermediate transfer belt 20 and
spaced sequentially along the direction of rotation of the
intermediate transfer belt 20.
The image forming station 31 includes a photoconductor drum 311, an
electrostatic charger 312, an exposure scanning head 313, a
developing device 314, a photoconductor cleaner 315, and a primary
transfer roller 316. In the image forming station 31, the
electrostatic charger 312, the exposure scanning head 313, the
developing device 314, the photoconductor cleaner 315, and the
primary transfer roller 316 are disposed around the photoconductor
drum 311, which rotates in a direction indicated by an arrow n in
FIG. 1. The primary transfer roller 316 faces the photoconductor
drum 311 via the intermediate transfer belt 20.
The configurations of the image forming station 32, the image
forming station 33, and the image forming station 34 are similar to
the configuration of the image forming station 31. Therefore,
further explanation of the configurations of the image forming
station 32, the image forming station 33, and the image forming
station 34 will be omitted.
The secondary transfer roller 23 faces the backup roller 22 via the
intermediate transfer belt 20. The secondary transfer roller 23
transfers the toner image from the intermediate transfer belt 20 to
a print medium passing between the secondary transfer roller 23 and
the backup roller 22.
Two registration rollers 24 convey the print medium taken out from
any of the paper feed cassette 111, the paper feed cassette 112,
and the manual feed tray TA by a conveyance mechanism to the
secondary transfer roller 23.
The manual feed roller 25 takes out a print medium from the manual
feed tray TA and conveys this print medium to the two registration
rollers 24.
The fixing device AD fixes the toner image to the print medium
after the toner image is secondarily transferred by the secondary
transfer roller 23. More specifically, the fixing device AD fixes
the toner image secondarily transferred onto the print medium onto
the print medium while conveying the print medium by rollers. Thus,
an image is formed on the print medium.
The duplex printing device DF is a device that conveys the print
medium back to the registration rollers 24 from the fixing device
AD for double-sided printing after an image has been formed on the
front surface of the print medium. AD.
(Operation of Image Forming Unit)
First, the operation of the four image forming stations 31, 32, 33,
34 will be described by taking the operation of the image forming
station 31 as a representative example.
In the image forming station 31, the photoconductor drum 311 is
charged by the electrostatic charger 312 and then selectively
exposed by the exposure scanning head 313. Thus, the image forming
station 31 forms an electrostatic latent image on the
photoconductor drum 311. Thereafter, the image forming station 31
causes the developing device 314 to develop the electrostatic
latent image on the photoconductor drum 311. The developing device
314 develops the electrostatic latent image as a toner image on the
photoconductor drum 311 using a two-component developer comprising
a toner and carrier. The primary transfer roller 316 transfers the
toner image formed on the photoconductor drum 311 to the
intermediate transfer belt 20. After this transfer (referred to as
a primary transfer), the photoconductor cleaner 315 removes toner
still remaining on the photoconductor drum 311.
Each of the image forming station 31, the image forming station 32,
the image forming station 33, and the image forming station 34
forms a different color toner image on the intermediate transfer
belt 20. A full color toner image can be formed by sequentially
superimposing the different toner images of Y (yellow), M
(magenta), C (cyan), and K (black) one on the other.
The secondary transfer roller 23 collectively transfers (referred
to as a secondary transfer) the superimposed color toner images on
the intermediate transfer belt 20 to the print medium as the print
medium passes between the secondary transfer roller 23 and the
intermediate transfer belt 20. In the following description, a
"toner image" may be either a full color toner image or a toner
image of only one color. In some examples, the toner image may be
formed using a decolorable toner.
Next, among the operations of the image forming unit 114, the
operation of conveying a print medium will be described.
The print medium (taken out from each of the paper feed cassette
111, the paper feed cassette 112, or the manual feed tray TA) is
abutted against the nip formed between the two registration rollers
24 by a conveyance mechanism. As a result, the front end of the
print medium is aligned (sheet skew/angle is corrected).
Thereafter, the two registration rollers 24 convey the print medium
to pass between the secondary transfer roller 23 and the
intermediate transfer belt 20 in accordance with the timing at
which the image forming unit 114 is required to transfer the toner
image onto the print medium. The various conveyance paths from each
of the paper feed cassette 111, the paper feed cassette 112, and
the manual feed tray TA to the two registration rollers 24 merge at
the merging portion PA shown in FIG. 1.
In the image forming unit 114, a conveyance path LA, a conveyance
path LB, and a conveyance path LC are provided. These three
conveyance paths LA, LB, LC are formed by the two registration
rollers 24, the fixing device AD, and a plurality of rollers in the
duplex printing device DF. The conveyance path LA is from the
merging portion PA to the branching portion PB illustrated in FIG.
1. The conveyance path LB passes through the inside of the duplex
printing apparatus DF, and is a conveyance path from the branching
portion PB back to the merging portion PA. The conveyance path LC
is from the branching portion PB to the sheet discharge tray
TB.
The registration rollers 24 start rotating in accordance with the
position of the toner image on the rotating intermediate transfer
belt 20, and move the print medium to the position of the secondary
transfer roller 23 to meet the toner image. As a result, the toner
image formed on the intermediate transfer belt 20 is transferred
onto the print medium by the secondary transfer roller 23 at an
appropriate position. After the toner image is transferred to the
print medium, the secondary transfer roller 23 conveys the print
medium along the conveyance path LA to the fixing device AD. The
fixing device AD fixes the toner image to the print medium. The
fixing device AD then conveys the print medium to the conveyance
path LC. The print medium conveyed to the conveyance path LC can be
discharged by a discharge roller or the like.
In the case of double-sided printing, after an image is formed on
the front surface and the entire print medium passes through the
branching portion PB, a switchback roller or the like conveys the
print medium to the conveyance path LB. As a result, the front
surface and the back surface of the print medium are reversed.
Thereafter, rollers in the duplex printing apparatus DF convey the
print medium along the conveyance path LB back to the nip between
the two registration rollers 24. Then, the print medium (whose
front surface and back surface are now reversed) is conveyed along
the conveyance path LA via the two registration rollers 24, and
another toner image can be fixed by the fixing device AD. Thus, an
image is formed on the back surface of the print medium. The fixing
device AD conveys the print medium having an image formed on the
back surface thereof to the conveyance path LC and discharges the
print medium.
As described above, the secondary transfer roller 23, the two
registration rollers 24, the fixing device AD, and various rollers
in the duplex printing device DF constitute a conveyance path that
conveys the print medium in the image forming apparatus 1.
(Position of Radiation Region on Conveyance Path)
The position of the radiation region RA on the conveyance path LA
will be described. The proportion of high gain regions in the
radiation region RA may change depending on specific position of
the radiation region RA along the conveyance path LA.
In the example illustrated in FIG. 1, the radiation region RA is
located on the conveyance path LA upstream of the two registration
rollers 24. This is because if the radiation region RA is located
on the downstream side of the two registration rollers 24, the
proportion of the high gain regions in the radiation region RA
tends to be smaller in view of the relative positioning of the
antenna 131. That is, by setting the radiation region RA on the
upstream side of the two registration rollers 24 along the
conveyance path LA, the proportion of the high gain regions in the
radiation region RA can be increased. As a result, the image
forming apparatus 1 can more surely avoid tag writing failures.
In the example illustrated in FIG. 1, the radiation region RA is
located at position higher than the manual feed roller 25. The
manual feed tray TA is often positioned above the sheet feed
cassette 111 and the paper feed cassette 112. Therefore, a print
medium placed on the manual feed tray TA may be exposed to radio
waves radiated from the antenna 131. If a print medium with a
wireless tag is placed on the manual feed tray TA, then unintended
writing of tag information to the wireless tag may be performed.
When an area located above the manual feed roller is used for the
radiation region RA, the image forming apparatus 1 can avoid
unintended writing to the wireless tag.
The radiation region RA may be located downstream of the two
registration rollers 24 on the conveyance path LA. The radiation
region RA may be a region where part or all of the two registration
rollers 24 overlap when the radiation conveyance path LA is viewed
in the direction of the radiation direction. In this case, the
radiation region RA may be located below the manual feed roller 25.
In this case, the radiation region RA may partially or entirely
overlap the manual feed roller 25.
(Configuration of Control Unit)
Next, a configuration of the control unit 110 will be described
with reference to FIG. 5.
As shown in FIG. 5, the control unit 110 is communicably connected
to the printer unit 11, the control panel 12, and the wireless tag
communication device 13. The control unit 110 includes an
arithmetic device 1101, a storage device 1102, a data reception
unit 1103, and an image data expansion unit 1104.
The arithmetic device 1101 is, for example, a CPU (Central
Processing Unit) or an ASIC (Application Specific Integrated
Circuit). The arithmetic unit 1101 controls the printer unit 11,
the control panel 12, and the wireless tag communication device 13
in accordance with an image processing program stored in the
storage device 1102. For example, the control unit 110 outputs
conveyance start information indicating conveyance of the print
medium has started.
The storage device 1102 is ROM (Read Only Memory), RAM (Random
Access Memory), a HDD (Hard Disk Drive), a SSD (Solid State Drive),
or the like. The storage device 1102 may be separate from the
controller 110.
The data reception unit 1103 receives print information (for
example, information described in a page description language) from
a host such as a PC (Personal Computer) indicating the image to be
printed, and stores the received print information in the storage
device 1102.
The image data expansion unit 1104 determines print conditions from
the print data stored in the storage device 1102, converts the
print data into data that can be printed by the printer unit 11
(for example, raster data), and stores this data in the storage
device 1102.
(Process by Which the Image Forming Apparatus Writes Tag
Information to Wireless Tag)
With reference to FIG. 6, a process by which the image forming
apparatus 1 writes tag information to a wireless tag will be
described. FIG. 6 is a flowchart of processing in which the image
forming apparatus 1 writes tag information to a wireless tag.
As one example, a case where the polarization direction information
is tag position information will be described. The processing
corresponding to the flowchart illustrated in FIG. 6 will be
described assuming that the following processes (1) to (5) are
performed before the start of the flowchart process. The
pre-processing start time is before the ACT101 processing shown in
FIG. 6 is performed.
(1) The image forming apparatus 1 receives image data of an image
to be printed on a print medium. (2) The image forming apparatus 1
receives an input operation for selecting the type of print medium
via the control panel 12. (3) The image forming apparatus 1
receives an input operation to start writing tag information to the
wireless tag. (4) Tag position information is stored in advance in
the storage device 1102 for each type of print medium. (5) Print
medium information is stored in advance in the storage device 1102
for each type of print medium.
The print medium information in this context relates to the print
medium types, and is, for example, information indicating
characteristics of the print medium such as the size of the print
medium, the thickness of the print medium, and the like. The print
medium information may also include tag position information. In
other words, the print medium information may include polarization
direction information.
The control unit 110 specifies the type of print medium that has
been selected by the user in advance via the control panel 12
(ACT101). As an example, the type of print medium specified in
ACT101 is the first print medium PRA.
Based on the type of print medium specified in ACT101, the control
unit 110 specifies tag position information for the one or more
wireless tags attached to the print medium (ACT102). At this time,
the control unit 110 identifies specific tag position information
according to the selected print medium type from among a plurality
of pieces of tag position information that has have been previously
stored in the storage device 1102. In this example, the type of
print medium is the first print medium PRA type. In this case, the
control unit 110 selects tag position information indicating the
position of the wireless tag TGA and the wireless tag TGB on the
first print medium PRA from the plurality of pieces of tag position
information stored in the storage device 1102.
The tag position information indicating the position of the
wireless tag TGA may be any information as long as it is capable of
indicating the position of the wireless tag TGA. The tag position
information may be, for example, position coordinates on the
surface of the first print medium PRA. The tag position information
may be, for example, a code associated with the position based on a
predetermined rule.
Likewise, the tag position information indicating the position of
the wireless tag TGB may be any information as long as it is
capable of indicating the position of the wireless tag TGB. The tag
position information may be, position coordinates on the surface of
the first print medium PRA or a code associated with the position
based on a predetermined rule.
Based on the type of print medium specified in ACT101, the control
unit 110 identifies print medium information related to the type of
print medium from among a plurality of pieces of print medium
information stored in advance in the storage device 1102 (ACT103).
In the present example, the control unit 110 specifies the print
medium information related to the first print medium PRA type. In
some examples, the processing of ACT103 may be performed by the
control unit 110 in parallel with the processing of the ACT102, or
may be performed by the control unit 110 before the processing of
the ACT102.
The control unit 110 sets (specifies) parameters related to
conveyance of the print medium based on the print medium
information specified in ACT103. In this context, a parameter to be
set is a conveyance speed or the like. The control unit 110
controls the image forming unit 114 based on the set parameters,
and starts conveyance of the print medium accordingly (ACT104). In
this example, the set parameter is set to a value appropriate for
conveyance of the first print medium PRA type.
The control unit 110 begins measuring the elapsed time (e.g.,
starts a clock or timer) from the start of conveyance (ACT105). The
control unit 110 specifies the timing at which the conveyance of
the print medium is started as the time at which the signal for
starting the conveyance of the print medium is output. The control
unit 110 may be configured to specify the time at which conveyance
of the print medium is started by other methods. For example, the
controller 110 may be configured to specify the start time based on
an output from one or more position sensors that detect the
position of the print medium on the conveyance path LA. For
example, the control unit 110 may be configured to start the
elapsed timing based on a combination of the time at which the
signal is output as well as outputs from one or more position
sensors.
The control unit 110 waits until a predetermined first time elapses
after the start (in ACT104) of the conveyance of the print medium
based on the elapsed time when the clock is started in ACT105
(ACT106). In this context, the first time is the expected time
required from the start of the conveyance until the wireless tag
TGA begins to pass through the radiation region RA. The control
unit 110 sets the first time length based on the type of the print
medium specified in ACT101 and the first correspondence information
in the storage device 1102. The first correspondence information is
information in which at least a part of the parameters set in
ACT103 are associated with the first time for each type of print
medium. For example, the first correspondence information is
information in which the conveyance speed value and a first time
length are associated with each other for each type of print
medium. In some examples, the control unit 110 may be configured to
calculate the first time length based on the type of print medium
and the first correspondence information. In this case, the control
unit 110 uses, for example, the known distance over which the print
medium is to be conveyed, or the like, to calculate the first time.
In other examples, the control unit 110 may be configured to detect
that the RFID tag TGA has started to pass through the radiation
region RA based on the output from one or more position sensors. In
such a case, in ACT106, the control unit 110 determines whether or
not it is detected that the wireless tag TGA has started to pass
through the radiation region RA. In some examples, the control unit
110 may be configured to detect that the wireless tag TGA has
started to pass through the radiation region RA based on the
elapsed time and the output from one or more position sensors. Also
in such a case, in ACT106, the control unit 110 determines whether
or not it is detected that the wireless tag TGA has started to pass
through the radiation region RA.
When it is determined that the first time has elapsed since the
start of the conveyance of the print medium (ACT106; YES), the
control unit 110 attempts to write the tag information to the
wireless tag TGA (ACT107). More specifically, the control unit 110
specifies the polarization direction associated with the tag
position information based on the tag position information
indicating the position of the wireless tag TGA in ACT107. This tag
position information can be one of two pieces of tag position
information specified in ACT102. The control unit 110 matches the
polarization direction of the polarized wave radiated from the
antenna 131 with the specified polarization direction. The
polarization direction specified by the control unit 110 is the
vertical direction in this example. That is, in ACT107, the control
unit 110 causes the antenna 131 to radiate the vertically polarized
wave based on the tag position information indicating the position
of the RFID tag TGA, and writes the tag information to the RFID tag
TGA using the vertically polarized wave.
The control unit 110 next waits until a predetermined second time
elapses after the conveyance of the print medium is started based
on the elapsed time since the clock start is ACT105 (ACT108). The
second time is longer than the first time. The second time is the
time from the start of the conveyance until the wireless tag TGB
begins to pass through the radiation region RA. In ACT108, the
control unit 110 sets the second time length based on the type of
print medium specified in ACT101 and the second correspondence
information stored in the storage device 1102. In second
correspondence information at least some of the parameters set in
the ACT103 are associated with the second time for each type of
print medium. For example, in the second correspondence information
the conveyance speed and the second time are associated with each
other for each type of print medium. In some examples, the control
unit 110 may be configured to calculate the second time based on
the type of print medium and the second correspondence information.
In this case, the control unit 110 uses, for example, the distance
over which the print medium is to be conveyed to calculate the
second time. In some examples, the control unit 110 may be
configured to detect when the wireless tag TGB starts to pass
through the radiation region RA based on the output from one or
more position sensors. In this case, in ACT108, the control unit
110 determines whether or not the wireless tag TGB has been
detected starting to pass through the radiation region RA. The
control unit 110 may be configured to determine that the wireless
tag TGB has started to pass through the radiation region RA using
an elapsed time and the output from one or more position
sensors.
When it is determined that the second time has elapsed after the
conveyance of the print medium was started (ACT108-YES), the
control unit 110 attempts to write the tag information to the
wireless tag TGB (ACT109). More specifically, the control unit 110
specifies the polarization direction based on the tag position
information indicating the position of the wireless tag TGB. This
tag position information is the remaining one of the two pieces of
tag position information that were specified in ACT102. The control
unit 110 matches the polarization direction of the polarized wave
radiated emitted from the antenna 131 to the specified polarization
direction. Here, the polarization direction specified by the
control unit 110 is the horizontal direction. That is, in ACT109,
the control unit 110 causes the antenna 131 to radiate a
horizontally polarized wave for the wireless tag TGB, and writes
the tag information to the wireless tag TGB using the horizontally
polarized wave.
The control unit 110 ends the clocking of the elapsed time started
in ACT105 (ACT110), and ends the processing of the flowchart
illustrated in FIG. 6.
In FIG. 6, in order to clarify the process of writing the tag
information to the wireless tag, the description of the process
related to the discharge of the first print medium PRA, the process
of forming an image on the first print medium PRA, and the like is
omitted. If the wireless tag TGA is attached to the first print
medium PRA but the wireless tag TGB is not attached to the first
print medium PRA, the processing of ACT108 and the processing of
ACT109 can be omitted. When the wireless tag TGA is not attached to
the first print medium PRA but the wireless tag TGB is attached to
the first print medium PRA, the processing of ACT106 and the
processing of ACT107 can be omitted.
(Screen by Which Image Forming Apparatus Receives Selection of Type
of Print Medium from User)
With reference to FIG. 7, an operation image (e.g., a user
interface screen or panel) by which the image forming apparatus 1
receives an input operation for selecting the type of print medium
from the user will be described. FIG. 7 depicts an example of an
operation image in which the image forming apparatus 1 receives an
operation for selecting a type of print medium to be used in the
image forming apparatus 1. An operation image PCT illustrated in
FIG. 7 is one example of an operation image by which the image
forming apparatus 1 receives an input operation for selecting the
type of the print medium from the user. The operation image PCT is
displayed on the display unit of the control panel 12. In the
example illustrated in FIG. 7, the display unit of the control
panel 12 is configured as a touch panel. A case will be described
in which the image forming apparatus 1 has already received the
size of the print medium to be used from an operation image
different from the operation image PCT illustrated in FIG. 7.
The label "First storage unit" on the operation image PCT in FIG. 7
is information indicating the associated region(s) and/or button(s)
in the operation image PCT are related to the paper feed cassette
111. The label "Second storage unit" on the operation image PCT in
FIG. 7 is information indicating associated regions(s) and/or
buttons in the operation image PCT are related to the paper feed
cassette 112.
The operation image PCT includes a button PCTA, a button PCTB, a
button PCTC, a button PCTD, a button PCTE, and a button PCTF.
The buttons PCTA to PCTC are associated with the paper feed
cassette 111.
The button PCTA is a button for selecting thick paper as the type
of print medium stored in the paper feed cassette 111. When a
selection operation, such as a touch operation, is performed on the
button PCTA, the control unit 110 selects thick paper as the type
of print medium stored in the paper feed cassette 111.
The button PCTB is a button for selecting plain paper as the type
of print medium stored in the paper feed cassette 111. When a
selection operation is performed on the button PCTB, the control
unit 110 selects plain paper as the type of print medium stored in
the paper feed cassette 111.
The button PCTC is a button for selecting wireless tag paper as the
type of print medium stored in the paper feed cassette 111. When a
selection operation is performed on the button PCTC, the control
unit 110 selects wireless tag paper as the type of print medium
stored in the paper feed cassette 111.
The button PCTD is a button for selecting thick paper as the type
of print medium stored in the paper feed cassette 112. When a
selection operation is performed on the button PCTD, the control
unit 110 selects thick paper as the type of print medium stored in
the paper feed cassette 112.
The button PCTE is a button for selecting plain paper as the type
of print medium stored in the paper feed cassette 112. When a
selection operation is performed on the button PCTE, the control
unit 110 selects plain paper as the type of print medium stored in
the paper feed cassette 112.
The button PCTF is a button for selecting wireless tag paper as the
type of print medium stored in the paper feed cassette 112. When a
selection operation is performed on the button PCTF, the control
unit 110 selects wireless tag paper as the type of print medium
stored in the paper feed cassette 112. In this example, the label
"cardboard" refers to, for example, paper having a basis weight
greater than 90 g/m.sup.2. The label "plain paper" refers to, for
example, paper having a basis weight of about 35 to 90 g/m.sup.2.
The label "wireless tag paper" refers to a print medium having a
wireless tag thereon or therein.
The image forming apparatus 1 receives an input operation for
selecting the type of print medium from the user via the operation
image PCT being displayed on the display unit of the control panel
12. Thus, the image forming apparatus 1 can specify the type of
print medium as selected by the user in the ACT101 shown in FIG. 6,
for example.
(First Modification)
An image forming apparatus 1 according to a first modification
includes a print medium information detection unit that detects
print medium information related to a print medium to be printed.
The print medium information detection unit comprises, for example,
one or more sensors that detect the size of the print medium, the
thickness of the print medium, and the like. In the image forming
apparatus 1, sensors provided in or integrated with the paper feed
cassette 111 and the paper feed cassette 112 may be used as a print
medium information detection unit.
In the image forming apparatus 1, a sensor provided near the two
registration rollers 24 may be used as the print medium information
detection unit. When the print medium information detection unit is
provided, the image forming apparatus 1 specifies the type of the
print medium based on the print medium information detected by the
print medium information detection unit. The image forming
apparatus 1 then reads the tag position information associated with
the specified type of print medium from the storage device 1102 and
1 sets the polarization direction of the polarized wave radiated
from the antenna 131 based on the read tag position information.
That is, even in this case, the image forming apparatus 1 can
prevent or reduce failures of writing the tag information to the
wireless tag.
(Second Modification)
An image forming apparatus 1 according to the second modification
includes a tag position information detection unit that detects tag
position information for the one or more wireless tags attached to
a print medium. The tag position information detection unit is, for
example, a wireless communication device including an antenna
different from the antenna 131. Such a wireless communication
device may be configured integrally with the wireless tag
communication device 13, or may be configured separately from the
wireless tag communication device 13, for example.
When the image forming apparatus 1 includes a tag position
information detection unit, ACT102 illustrated in FIG. 6 can be
omitted. In this case, the image forming apparatus 1 detects
information indicating the position on the print medium of the
wireless tags attached to the print medium using radio waves
emitted from the antenna. The image forming apparatus 1 performs
the detection of the tag position information during a period
beginning from the start of the processing of the ACT104 until the
print medium is conveyed to the radiation region RA. The image
forming apparatus 1 detects tag position information by radiating
radio waves from the antenna to a second radiation region located
upstream of the radiation region RA on the conveyance path LA. The
method of detecting the information indicating the position of the
wireless tags based on the radio wave radiated from an antenna may
be any method. Therefore, particulars of a method of detecting
information indicating the position of the wireless tag based on
the radio wave radiated from an antenna will not be described.
The second modification can be combined with the first modification
to reduce the amount of input operations to be performed by the
user of the image forming apparatus 1.
The image forming apparatus 1 according to such a combination can
also determine whether or not a conveyed print medium is a print
medium that is usable in the image forming apparatus 1. The image
forming apparatus 1 may be configured to stop conveyance, stop
printing, stop writing of tag information to a wireless tag, or the
like when it is determined that the print medium is not present in,
or of an inappropriate type for, the image forming apparatus 1. In
such a case, the image forming apparatus 1 may be configured to
alert the user by displaying an error message on the display unit
of the control panel 12. As a result, the image forming apparatus 1
can prevent printing, writing of tag information to a wireless tag,
and the like from being performed on a print medium that cannot be
used in the image forming apparatus 1. A print medium that cannot
be used in the image forming apparatus 1 may be a print medium that
is not specifically registered in the image forming apparatus 1,
but is not limited thereto.
(Third Modification)
An image forming apparatus 1 according to a third modification
determines whether the type of print medium type selected by the
user is a print medium type usable in the image forming apparatus
1. More particularly, the image forming apparatus 1 determines
whether the user selected print medium is usable in the image
forming apparatus 1 based on the type of the print medium specified
in ACT101.
For example, when the tag position information associated with the
selected type is not stored in the storage device 1102, the image
forming apparatus 1 determines that the print medium is of a type
that cannot be used in the image forming apparatus 1.
For example, when the print medium information associated with the
selected type is not stored in the storage device 1102, the image
forming apparatus 1 determines that the print medium is of a type
that cannot be used in the image forming apparatus 1. When the
image forming apparatus 1 determines that the print medium cannot
be used in the image forming apparatus 1, the image forming
apparatus 1 stops conveyance, printing, writing of tag information
to a wireless tag, and the like. In this case, the image forming
apparatus 1 alerts the user by displaying an error message on the
display unit of the control panel 12. As a result, the image
forming apparatus 1 can prevent writing of tag information to a
wireless tag, and the like on a print medium which cannot be used
in the image forming apparatus 1.
(Fourth Modification)
An image forming apparatus 1 according to the fourth modification
includes a position and orientation changing mechanism that changes
the position and/or orientation of the antenna 131. In this case,
even when the wireless tag TGA obliquely intersects with the
conveyance direction of the first print medium PRA, the image
forming apparatus 1 can match the long axis of the wireless tag TGA
with the polarization direction of the polarized wave radiated from
the antenna 131. As a result, the image forming apparatus 1 can
more reliably reduce the failures of writing the tag information to
the wireless tag.
As described above, the image forming apparatus includes a
conveyance unit, an antenna, a storage unit, and a control unit.
The conveyance unit conveys a print medium to which one or more
wireless tags are attached. The antenna radiates radio waves to a
predetermined radiation region on a conveyance path. The storage
unit stores polarization direction information indicating a
polarization direction of a radio wave for each type of print
medium. The control unit controls the antenna, causes the antenna
to radiate polarized waves to a radiation region as radiation of
radio waves, and writes tag information to each of one or more
wireless tags in the radiation region. The control unit specifies
the type of the print medium, reads the polarization direction
information associated with the specified type of the print medium
from the storage unit, and changes the polarization direction of
the polarized wave radiated from the antenna based on the read
polarization direction information. As a result, the image forming
apparatus can reduce the failures in writing of the tag information
to the wireless tag.
A program for realizing the above-described functions of an image
forming apparatus 1 or the like may be recorded in a
non-transitory, computer-readable recording medium, and the program
may be read and executed by a computer system. A "computer system"
in this context can include an operating system and additional
hardware such as peripheral devices. A "computer-readable recording
medium" in this context refers to a portable medium such as a
flexible disk, a magneto-optical disk, or a ROM, CD (Compact
Disk)-ROM, or a storage device such as a hard disk incorporated in
a computer system. The "computer-readable recording medium" may be
a computer system serving as a server or a client when the program
is transmitted via a network such as the Internet or a
communication line such as a telephone line.
While certain embodiments have been described, these embodiments
have been presented by way of example only, and are not intended to
limit the scope of the inventions. Indeed, the novel embodiments
described herein may be embodied in a variety of other forms;
furthermore, various omissions, substitutions and changes in the
form of the embodiments described herein may be made without
departing from the spirit of the inventions. The accompanying
claims and their equivalents are intended to cover such forms or
modifications as would fall within the scope and spirit of the
inventions.
* * * * *